Electrical communicating apparatus.



T. M. ST. JOHN. ELECTRICAL COMMUNICATING APPARATUS.

APPLIOATION FILED DBO, 4, 1909.

1,018,940. a Patented Feb.27, 1912.

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THOMAS M. sT. JOHN,

or NEW YORK, N. Y.

ELECTRICAL COMMUNICATING APPARATUS.

Specification of Letters Patent.

Patented Feb. 27, 1912.

ApplicationfiledDecember 4, 1909. Serial No. 531,305.

To all whom it may concern:

Be it known that I, THOMAS M. ST. JOHN, a citizen of the United Statesof America, residing in the borough of Manhattan, city, county, andState of New York, have invented a certain Improved ElectricalCommunicating Apparatus, of which the following is a specification.

This invention is intended primarily for the use of young-folks and isdesigned for their amusement, and also for their instruction respectingthe use of electricity for telegraphic and telephonic communications.

In the accompanying drawing: Figure l is a diagram illustrating theinvention and Fig. 2, a side elevation showing more particularly thesignal magnet.

B indicates a battery which may be composed of ordinary dry cells. Onepole is connected by wire 1 to post 2 which is elec trically connectedwith a normally open spring transmitting key 3 whose bottom contact 4 isconnected by wire 5 with the frame 6 of an electro-magnet comprisingpart of an ordinary electric vibrator or buzzer and thence to the buzzerspring contact 8 carried on the armature lever 7. The other pole of thebattery is-connected by wire 10 to binding post 11 and thence by wire 12to switch arm 13 whose stationary contact 14 is connected by wire 15through the windings of the electro-magnet and thence by wire 9 to aninsulated bracket 9 carried on one-of the pole pieces of the magnet andin which is the fixed adjustable buzzer contact 9. The bracket 9 isconnected by wire 16 to binding posts 17 The terminals of the maincircuit are connected to the binding posts 11 and 17 as are also theterminals of an electro-magnetic telephonic receiver 18.

There is a telephonic transmitter 19 whose terminals are connected withbinding posts 2 and 17 and which is provided with a normally open springswitch 20 by which it may be introduced into circuit for telephonictransmission and cut out while the operator is receiving telephoniccommunication from the receiver 18.

For Morse transmission into the main circuit switch 13, 14, is closed.When Morse key 3 is operated dots and dashes.may be transmitted over themain circuit or line and received at the distant station in a telephonereceiver such as 18 connected in the manner shown in the drawingboth thesending and receiving stations being correspondingly equipped. The sparkgap or circuit breaking contacts 8 and 9 of the buzzer are in derived orparallel circuit with the Morse transmission circuit with the eifectthat the inductive or static efiect of the spark results in theproduction of Morse signals characterized at the receiving end of theline by great intensity or energy, sharpness and distinctness.

For the telephonic transmission, switch 13, 14, is open and the Morsekey 3 is, of course, by its own react-ion held open. When speaking intothe carbon or other transmitter 19, the operator closes switch 20 andtelephonic communication over the main circuit may be conducted. vWhenthe operator ceases speaking and listens to the speaker at the distantstation, the pressure on switch 20 is released opening the circuitthrough the transmitter which circuit is a shunt on the circuitcontaining the telephonic receiver 18. This arrangement I have foundproductive of great distinctness in articulation in the transmission ofspoken words. 7

I claim:

An apparatus for transmission of telegraphic signals comprising atransmitter. a source of electrical energy, an electro-magnetic buzzer,a circuit connection including the winding of the buzzer, thetransmitter and said source, and a derived circuit including the circuitbreaking contacts of the buzzer.

In testimony whereof, I have hereunto subscribed my name.

THOMAS M. ST. JOHN.

Witnesses:

JOHN K. Moons, EDWARD C. DAVIDSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Batents, Washington, D.- G.

